Is a little corner glow a defect?

Apparent glow can change with angle, exposure and panel technology. Compare straight on at normal brightness; this page cannot classify warranty status or physical cause.

Can I photograph the screen to document it?

For record keeping yes, but never as a measurement. Automatic exposure and image processing can make bleed appear stronger in dark scenes. Judge with your own eyes and use the photo only as an attachment.

Screen Uniformity Test

By MonitorSmith editorial team · EXVORN.TECH • Updated September 9, 2026 • Editorial process

The tool steps through digital gray levels from 0% to 100%, with an optional nine-zone grid for visually comparing centre, edges and corners.

Open tool fullscreen →

Interface and local controls remain in Portuguese.

How to use

Turn the room lights off, keep your normal brightness and enter fullscreen with the F key.
Start at the 0% step and inspect centre, edges and corners straight on, from about 70 cm away.
Move up to 5%, 10% and 50% while comparing the nine zones against each other; note where differences are visible to the naked eye.

When to use

Assess a freshly bought monitor while the applicable return policy remains in effect.
Document patches and bleed before opening a warranty or RMA request.
Compare two panels side by side under identical lighting conditions.
Record apparent changes in uniformity or retention under repeated conditions.

Limitations

Perceived uniformity depends on brightness, angle and ambient light. This is a visual reference: measuring percentage luminance deviation between zones requires a photometric probe and the VESA FPDM procedure.

Frequently Asked Questions

Is a little corner glow a defect?: Apparent glow can change with angle, exposure and panel technology. Compare straight on at normal brightness; this page cannot classify warranty status or physical cause.
Can I photograph the screen to document it?: For record keeping yes, but never as a measurement. Automatic exposure and image processing can make bleed appear stronger in dark scenes. Judge with your own eyes and use the photo only as an attachment.

Technical Methodology & Display Science

Steps request equal RGB values calculated between 0 and 255. Colour management, composition, scaling, GPU and panel processing can transform the physical output.

The 3 × 3 grid helps name regions and repeat observations. It does not implement a VESA photometric procedure or calculate zone deviation.

Distance, angle, brightness, visual adaptation and ambient light alter results. Record those conditions when comparing sessions.